|Book II Proposition 8|
CG is equal to GQ, and QR to RP,
AG is also equal to MQ, and QL to RF, [I.36]
MQ is equal to QL, for they are complements of the parallelogram ML; [I.43] therefore
AG is also equal to RF;
the four areas AG, MQ, QL, RF are equal to one another.
the four are quadruple of AG.
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